It was the centerpiece of many infinite mana combos, utilizing other cards like Temur Sabertooth, Barrin, Master Wizard, and Cloudstone Curio
The label also includes a unique orange band that isnt featured in Pantone lists
Amethyst glimmers tend to be very powerful indeed with lots of control and manipulation of other glimmers in your hand, discard pile and in play
Now, they definitely have some steep competition
Im sure someone has thrown a Whispersilk Cloak on Akki Underminer and killed a couple of permanents but even then your opponent chooses what permanent to sacrifice
More often than not, especially with all of the great commons and uncommons being printed right now, there is more money in these packs than you may think